Journal
CARBOHYDRATE RESEARCH
Volume 346, Issue 8, Pages 1023-1028Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2011.03.013
Keywords
Algal polysaccharides; Xylans; beta-D-(1 -> 4), beta-D-(1 -> 3) 'mixed linkage'; structures; Nemaliales; Palmariales; Red seaweeds
Funding
- Fundacao Araucaria (Parana State, Brazil)
- CNPq (Brazil)
- National Research Council of Argentina (CONICET)
- University of Buenos Aires (UBA)
- CNPq
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Xylans from five seaweeds belonging to the order Nemaliales (Galaxaura marginata, Galaxaura obtusata, Tricleocarpa cylindrica, Tricleocarpa fragilis, and Scinaia halliae) and one of the order Palmariales (Palmaria palmata) collected on the Brazilian coasts were extracted with hot water and purified from acid xylomannans and/or xylogalactans through Cetavlon precipitation of the acid polysaccharides. The beta-D-(1 -> 4), beta-D-(1 -> 3) 'mixed linkage' structures were determined using methylation analysis and ID and 2D NMR spectroscopy. The presence of large sequences of beta-(1 -> 4)-linked units suggests transient aggregates of ribbon- or helical-ordered structures that would explain the low optical rotations. (C) 2011 Elsevier Ltd. All rights reserved.
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